Finding the Fourth Proportional to 9,890.16, 13,648.32 and 5,413.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.16 : 13,648.32 = 5,413.98 : x
2. Step 2: Convert to fraction form
   9,890.16/13,648.32 = 5,413.98/x
3. Step 3: Cross multiply
   9,890.16x = 13,648.32 × 5,413.98
4. Step 4: Simplify right side
   9,890.16x = 73,891,731.51
5. Step 5: Solve for x
   x = 73,891,731.51/9,890.16
6. Step 6: Final answer
   x = 7,471.24